% \iffalse meta-comment
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% memoize-ext.dtx
% Additions and changes Copyright (C) 2024-2026 Clea F. Rees.
% Code from skeleton.dtx Copyright (C) 2015-2024 Scott Pakin (see below).
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3c
% of this license or (at your option) any later version.
% The latest version of this license is in
%   https://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2008-05-04 or later.
%
% This work has the LPPL maintenance status 'muaintained'.
%
% The Current Maintainer of this work is Clea F. Rees.
%
% This work consists of all files listed in manifest.txt.
%
% The file memoize-ext.dtx is a derived work under the terms of the
% LPPL. It is based on version 2.4 of skeleton.dtx which is part of
% dtxtut by Scott Pakin. A copy of dtxtut, including the
% unmodified version of skeleton.dtx is available from
% https://www.ctan.org/pkg/dtxtut and released under the LPPL.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \fi
%
% \iffalse
%<*driver>
% ^^A  ref. ateb Max Chernoff: https://tex.stackexchange.com/a/723294/
\def\MyMakePrivateLetters{\makeatletter\ExplSyntaxOn\endlinechar13}
\GetIdInfo $Id: memoize-ext.dtx 11736 2026-03-06 08:08:45Z cfrees $ {Extensions for Memoize}
\ProvidesExplFile{\ExplFileName}{\ExplFileDate}{v0.3 \ExplFileVersion}{\ExplFileDescription}
\ExplSyntaxOff
\documentclass[11pt,british]{ltxdoc}
\usepackage{memoize-ext}
\def\memoizeextdocbase{memoize-ext}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
% ^^A  \OnlyDescription
\DoNotIndex{\verb,}
\usepackage{babel}
\usepackage{fancyhdr}
\usepackage[plain]{fancyref}
% ^^A  \usepackage{fixfoot}
% ^^A  \usepackage{array,tabularx}
% ^^A  \usepackage{longtable}
% ^^A  \usepackage{enumitem}
% ^^A  \usepackage[referable]{threeparttablex}
% ^^A  \makeatletter
% ^^A  \def\TPT@measurement{% ateb David Carlisle: https://tex.stackexchange.com/a/370691/
% ^^A    \ifdim\wd\@tempboxb<\TPTminimum
% ^^A      \hsize \TPTminimum
% ^^A    \else
% ^^A      \hsize\wd\@tempboxb
% ^^A    \fi
% ^^A    \xdef\TPT@hsize{\hsize\the\hsize \noexpand\@parboxrestore}\TPT@hsize
% ^^A    \ifx\TPT@docapt\@undefined\else
% ^^A      \TPT@docapt \vskip.2\baselineskip
% ^^A    \fi \par
% ^^A    \dimen@\dp\@tempboxb % new
% ^^A    \box\@tempboxb
% ^^A    \ifvmode \prevdepth\dimen@ \fi% was \z@ not \dimen@
% ^^A  }
% ^^A  \renewlist{tablenotes}{enumerate}{1}
% ^^A  \setlist[tablenotes]{label=\tnote{\alph*},ref=\alph*,itemsep=\z@,topsep=\z@skip,partopsep=\z@skip,parsep=\z@,itemindent=\z@,labelindent=\tabcolsep,labelsep=.2em,leftmargin=*,align=left,before={\unskip\medskip\footnotesize}}
% ^^A  \makeatother
% ^^A  \usepackage{booktabs}
% ^^A  \usepackage{multirow}
\usepackage{xcolor}
\usepackage{xurl}
% ^^A  \urlstyle{tt}
\urlstyle{sf}
\usepackage[tt={mono,lining,tabular},sf={lining,prop},rm={oldstyle,prop}]{cfr-lm}
\usepackage{microtype}
\usepackage[a4paper,headheight=14pt,marginparwidth=45mm,hmarginratio=4:1,vscale=.8,hscale=.7,verbose]{geometry}	% use 14pt for 11pt text, 15pt for 12pt text
% ^^A  addaswyd o forest-ext.dtx
\newlength\tewadjust
\newlength\doctemplgth
\AddToHook {begindocument/end}[.]
{%
  \setlength\tewadjust{%
    \dimeval{%
      \marginparwidth+\marginparsep-\paperwidth+\textwidth+\oddsidemargin+1in
    }%
  }%
  \setlength\doctemplgth{0pt}%
  \newgeometry{%
    headheight=14pt,scale=.8,marginparwidth=0pt,marginparsep=0pt,
  }%
  \savegeometry{safonol}%
  \fancyheadoffset[lh]{0pt}% ^^A REQUIRED - do NOT remove this line!!
  \pagenumbering{arabic}%
}
\newcommand \twmarg {%
  \restoregeometry
  \fancyheadoffset[lh]{\tewadjust}%
}
\newcommand \twreg {%
  \loadgeometry{safonol}%
  \fancyheadoffset[lh]{0pt}% ^^A REQUIRED - do NOT remove this line!!
}
\usepackage{csquotes}
\MakeAutoQuote{‘}{’}
\MakeAutoQuote*{“}{”}
% ^^A  copïwyd o forest-ext.dtx
\usepackage[citestyle=authoryear-comp,bibstyle=authoryear,mergedate=basic,isbn=false,url=true,sortcites=true,backend=biber,mincrossrefs=6]{biblatex}
\DeclareFieldFormat{eprint:ctan}{%
  \mkbibacro{CTAN}\addcolon\space
  \ifhyperref
    {\href{https://www.ctan.org/pkg/#1}{\nolinkurl{#1}}}
  {\nolinkurl{#1}}%
}
\DeclareFieldAlias{eprint:CTAN}{eprint:ctan}
% ^^A \bibliography{abbrv, authors, journals-series, pub, lleoedd, ref}
\bibliography{memoize-ext_biber}% ^^A generate for upload (gweler uchod)
% ^^A  \usepackage{minted}
\usepackage{hypdoc}% ateb Ulrike Fischer: https://tex.stackexchange.com/a/695555/
\usepackage{bookmark}
\hypersetup{%
  colorlinks=true,
  citecolor={moss},
  extension=pdf,
  linkcolor={strawberry},
  linktocpage=true,
  pdfcreator={TeX},
  pdfproducer={pdfeTeX},
  urlcolor={blueberry}%
}
\makeatletter
\setcounter{IndexColumns}{2}
\IndexMin=\dimexpr 0.3\textheight\relax
\defbibheading{bibliography}[\refname]{%^^A
  \section*{#1}%^^A
  \markboth{#1}{}}
\newcommand\orig@xobey@sp{}
\newcommand\permissivelines{%
  \def\@xobeysp{\leavevmode\penalty100\ }%
}
\newcommand\strictlines{%
  \let\@xobey@sp\orig@xobey@sp
}
\AddToHook{begindocument}[memoizeextdoc]{%
  \let\orig@xobey@sp\@xobey@sp
  \addtocontents{toc}{%
    \tlstyle
  }%
}
\def\section{%
  \@startsection{section}{1}{\z@}
  {-3.5ex\@plus -1ex\@minus -.2ex}
  {2.3ex\@plus .2ex}{\normalfont\sffamily\Large}%
}
\renewcommand*\l@section[2]{%
  \ifnum \c@tocdepth >\z@
    \addpenalty\@secpenalty
    \addvspace{1.0em \@plus\p@}%
    \setlength\@tempdima{1.5em}%
    \begingroup
      \leftskip 1.5em\relax
      \parindent 1.5em\relax
      \@afterindenttrue
      \rightskip \@pnumwidth
      \parfillskip -\@pnumwidth
      \leavevmode 
      \advance\leftskip\@tempdima
      \hskip -\leftskip
      {#1}\nobreak
      \leaders\hbox{%
        $\m@th
        \mkern \@dotsep mu\hbox{.}\mkern \@dotsep
        mu$%
      }\hfill
      \nobreak\hb@xt@\@pnumwidth{\hss #2%
        \kern-\p@\kern\p@}\par
    \endgroup
  \fi
}
\renewcommand*\l@subsection{\@dottedtocline{2}{3.8em}{3.2em}}
\renewcommand*\l@subsubsection{\@dottedtocline{3}{7em}{4.1em}}
\makeatother
\NewDocElement[%
  macrolike,
  idxtype=fn.,
  idxgroup=expl3 functions,
  printtype=\textit{fn.},
]{Fn}{fn}
\NewDocElement[%
  idxtype=key,
  idxgroup=expl3 keys,
  printtype=\textit{expl3 key},
]{Key}{key}
\NewDocElement[%
  printtype=\textdagger,
  idxtype=,
  idxgroup=,
  macrolike,
]{DMacro}{dmacro}
\NewDocElement[%
  idxtype=opt.,
  idxgroup=options,
  printtype=\textit{opt.},
]{Opt}{option}
\NewDocElement[%
  idxtype=pgfkey,
  idxgroup=pgfkeys,
  printtype=\textit{pgfkey},
]{Pgfkey}{pgfkey}
\NewDocElement[%
  idxtype=pkg.,
  idxgroup=,
  printtype=\textit{pkg.},
]{Pkg}{package}
\NewDocElement[%
  idxtype=plug,
  idxgroup=plugs,
  printtype=\textit{plug},
]{SPlug}{plug}
\NewDocElement[%
  idxtype=socket,
  idxgroup=sockets,
  printtype=\textit{socket},
]{Sock}{socket}
\NewDocElement[%
  macrolike,
  idxtype=toks,
  idxgroup=token registers,
  printtype=\textit{toks},
]{Toks}{toksr}
\NewDocElement[%
  macrolike,
  idxtype=var,
  idxgroup=expl3 variables,
  printtype=\textit{var.},
]{Var}{var}
\NewDocumentCommand \val { m }
{%
  {\ttfamily =\,\meta{#1}}%
}
\ExplSyntaxOn
\NewDocumentCommand \vals { m }
{
  {
    \ttfamily = \, 
    \clist_use:nn { #1 } { \textbar }
  }
} 
\keys_define:nn { memoize-ext / doc }
{
  unknown .code:n = {
    \cs_if_free:cT { \l_keys_key_str }
    {
      \tl_gset:cn { \l_keys_key_str } { #1 }
    }
  },
}
\NewDocumentCommand \memoizeextdocset { +m }
{
  \keys_set:nn { memoize-ext / doc } { #1 }
}
\cs_new_eq:NN \__memoizeextdoc_cs_orig:n \cs
\cs_new_protected:Npn \__memoizeextdoc_cs_expl:n #1
{
  \exp_args:Ne \__memoizeextdoc_cs_orig:n {\tl_to_str:n {#1}}
}
\cs_new_eq:NN \ecs \__memoizeextdoc_cs_expl:n
\ExplSyntaxOff
\memoizeextdocset{%
  bug={\href{https://codeberg.org/cfr/memoize-ext/issues}{\textsc{bugtracker}}},
  codeberg={\href{https://codeberg.org/cfr/memoize-ext}{\textsc{codeberg}}},
  github={\href{https://github.com/cfr42/memoize-ext}{\textsc{github}}},
  ctan={\href{https://ctan.org/}{\textsc{ctan}}},
}
% \usepackage{cleveref}
\newcommand*{\lpack}[1]{\textsf{#1}}
\newcommand*{\fgroup}[1]{\textsf{#1}}
\newcommand*{\fname}[1]{\textsf{#1}}
\newcommand*{\file}[1]{\texttt{#1}}
\newcommand*{\env}[1]{\texttt{#1}}
\newcommand*\TikZ{Ti\emph{k}Z}
\newcommand*\pgf{\textsc{pgf}}
\newcommand*\pgftikz{\pgf/\TikZ}
\NewDocumentCommand\texse{om}{%
  \href{https://tex.stackexchange.com/#2}{\TeX{} \textsc{se}\IfValueT{#1}{: #1}}%
}
\NewDocumentCommand\texseans{O{Based on \texse{} answer:} m o}{%
  #1 \href{https://tex.stackexchange.com/a/#2}{#2}%
  \IfValueT{#3}{ by #3}.%
}
% \NewDocumentCommand\texseqn{O{Based on \texse{} question} m o}{%
%   #1 \href{https://tex.stackexchange.com/q/#2}{#2}%
%   \IfValueT{#3}{ by #3}.%
% }
\title{\pkg{\ExplFileName}: Extensions for \pkg{memoize}}
\author{Clea F. Rees\thanks{%
    Bug tracker:
    \href{https://codeberg.org/cfr/memoize-ext/issues}{\url{codeberg.org/cfr/memoize-ext/issues}}
    \textbar{} Code:
    \href{https://codeberg.org/cfr/memoize-ext}{\url{codeberg.org/cfr/memoize-ext}}
    \textbar{} Mirror:
    \href{https://github.com/cfr42/memoize-ext}{\url{github.com/cfr42/memoize-ext}}% 
}}
\date{\ExplFileVersion~\ExplFileDate}
\pagestyle{fancy}
\fancyhf{}
\fancyhf[lh]{\itshape\ExplFileName}
\fancyhf[rh]{\itshape\ExplFileVersion}
\fancyhf[cf]{\itshape--- \thepage~/~\lastpage{} ---}
\ExplSyntaxOn
\hook_gput_code:nnn {shipout/lastpage} {.}
{
  \property_record:nn {t:lastpage}{abspage,page,pagenum}
}
\cs_new_protected_nopar:Npn \lastpage 
{
  \property_ref:nn {t:lastpage}{page}
}
\cs_new_eq:NN \OrigMakePrivateLetters \MakePrivateLetters
\hook_gput_code:nnn {begindocument/end} {.}
{
  \cs_set_eq:NN \MakePrivateLetters \MyMakePrivateLetters
  % \ShowCommand \OrigMakePrivateLetters
  % \ShowCommand \MyMakePrivateLetters
  % \ShowCommand \MakePrivateLetters
}
\ExplSyntaxOff
\definecolor{strawberry}{rgb}{1.000,0.000,0.502}
\definecolor{blueberry}{rgb}{0.000,0.000,1.000}
\definecolor{moss}{rgb}{0.000,0.502,0.251}
% ^^A \setminted{style=sas,breaklines=true,breakafter={\,},}
% ^^A \newminted {latex}{frame=single,rulecolor=darkgray,}
% ^^A \newminted {xml}{frame=single,rulecolor=darkgray,}

\begin{document}
% ^^A \let\MakePrivateLetters\MyMakePrivateLetters
\DocInput{\ExplFileName.dtx}
\end{document}
%</driver>
% \fi
%
% ^^A \changes{v1.0}{???}{First public release.}
% ^^A lua will replace v0.0 and 0000/00/00 when tagging
% ^^A \changes{v0.1}{2026-02-21}{}
% 
% \maketitle\thispagestyle{empty}
% \pdfinfo{%
% 	/Creator		(TeX)
% 	/Producer		(pdfTeX)
% 	/Author			(Clea F. Rees)
% 	/Title			(memoize-ext)
% 	/Subject		(TeX)
% 	/Keywords		(TeX,LaTeX,Clea,Rees)}
% \setlength{\parindent}{0pt}
% \setlength{\parskip}{0.5em}
% 
% 
% \begin{abstract}
%   \noindent\lpack{memoize-ext} provides extensions for \citeauthor{saso-memoize}'s package \pkg{memoize} \autocite*{saso-memoize}.
%   In particular, it supports the memoization of content in tagged \textsc{pdf}s and presentations produced with \citeauthor{joseph-talk}'s \pkg{ltx-talk} \autocite*{joseph-talk}.
% \end{abstract}
%
% \tableofcontents
%
% \twmarg
% \part{Usage}
%
% \section{Basics}\label{sec:basics}
% ^^A sec:basics <<<
% \changes{v0.3}{2026-03-02}{Correct and update usage details for \pkg{ltx-talk}.}
%
% Usage is simple.
% {\obeylines\MacroFont
%   \cs{documentclass}\marg{class}
%   \cs{usepackage}\{memoize-ext\}
% }
%
% The package will automatically load \pkg{memoize} and pass any unrecognised options onto that package.
%
% Note that to create a tagged presentation with \pkg{ltx-talk}, the package should be loaded \emph{after} the class\footnote{%
%   Note that \pkg{ltx-talk} diverges from \pkg{beamer} here, a point to which I was oblivious when I wrote the initial version of this documentation.%
% }.
% \iffalse
%<*verb>
% \fi
% \begin{verbatim}
% \DocumentMetadata{tagging=on,lang=en-GB,pdfversion=2.0,pdfstandard=UA-2,}
% \documentclass{ltx-talk}
% \usepackage{memoize-ext}
% \end{verbatim}
% \iffalse
%</verb>
% \fi
% If for any reason it is necessary to load the package \emph{prior} to the class in a tagged \textsc{pdf}, then tagging must be explicitly requested.
% For example,
% \iffalse
%<*verb>
% \fi
% \begin{verbatim}
% \DocumentMetadata{tagging=on,lang=cy,pdfversion=2.0,pdfstandard=ua-2,}
% \RequirePackage[tag]{memoize-ext}
% \documentclass{book}
% \end{verbatim}
% \iffalse
%</verb>
% \fi
% 
% If necessary, a small number of package options are available to customise which code is loaded.
% 
% \DescribeOpt{expl3}\vals{true,false}
% 
% Loads code supporting \pkg{expl3} syntax.
%
% Default is \texttt{true}.
% Initially \texttt{false}.
%
% \DescribeOpt{l3draw}\vals{true,false}
% 
% Loads code supporting \pkg{l3draw}, if the package is loaded.
%
% Default is \texttt{true}.
% Initially \texttt{true}.
%
% \DescribeOpt{tag}\vals{true,false}
% 
% Loads code supporting tagged \textsc{pdf}, if \LaTeX's tagging code is activated when the package is loaded.
% Note that this is \emph{not} true prior to \cs{documentclass}.
%
% Default is \texttt{true}.
% Initially \texttt{true} if tagging is activated; \texttt{false} otherwise.
% 
% \DescribeOpt{talk}\vals{true,false}
% 
% Loads code supporting \cls{ltx-talk}, if the class is loaded.
%
% Default is \texttt{true}.
% Initially \texttt{true}.
%
% Note that the additional code is not loaded if a different class is used, regardless of this setting.
% The option is provided in case it is necessary to disable support for the class, without disabling other parts of \pkg{memoize-ext}.
%
% \section{\pkg{expl3}}\label{sec:expl3}
% ^^A sec:expl3 <<<
% \DescribePgfkey{replicate~expl~fn} Sets up advice to ‘replicate’ an \pkg{expl3} function.
%
% This works similarly to the builtin support for commands created with \cs{NewDocumentCommand} etc\@.
% This means that it is not necessary to specify \texttt{args}.
%
% \textbf{Functions with \texttt{w}-type arguments are NOT supported.}
% Attempting to use this key with such a function will result in an error.
% Such cases require custom handling and can be configured using the standard \pkg{memoize} keys.
%
% \file{memoize-ext-l3draw.sty} demonstrates use of \texttt{replicate expl fn}:
% \iffalse
%<*verb>
% \fi
% \begin{verbatim}
% \mmzset{%
%   auto~csname={draw_begin:}{memoize,collector=\AdviceCollectDrawArguments,},
%   auto~csname={__draw_record_origin:}{run~if~memoizing,replicate~expl~fn,},
% }
% \end{verbatim}
% \iffalse
%</verb>
% \fi
% This code sets up a custom ‘collector’ and installs ‘advice’ which memoizes \ecs{draw_begin:}.
% It further advises \ecs{__draw_record_origin:} so that if this function is found during memoization, it will be replicated in the \texttt{ccmemo}.
% This ensures that the origin is recorded correctly when the memoized picture is utilised, since we do not want to record its position when memoized.
% 
% The net result of this is that auto-memoization of \pkg{l3draw} pictures should (hopefully) ‘just work’.
%
% ^^A >>> sec:expl3
%
% \section{\pkg{l3draw}}\label{sec:draw}
% sec:draw <<<
% \pkg{l3draw} pictures are auto-memoized by default.
% \file{memoize-ext-l3draw.sty} mostly exists to demonstrate use of \texttt{replicate expl fn}.
% >>> sec:draw
%
% \section{\pkg{ltx-talk}}\label{sec:talk}
% ^^A sec:talk <<<
%
% The code is based on that provided by \pkg{memoize} for \pkg{beamer} and supports the same options, except that ‘\texttt{talk}’ is substituted for ‘\texttt{bemaer}’.
% 
% \DescribePgfkey{per~overlay} Equivalent to the \pkg{beamer} option of the same name.
%
% \DescribePgfkey{talk~mode~to~prefix} Equivalent to \pkg{beamer mode to prefix}.
%
% The code uses and/or changes internal code from both \cls{ltx-talk} and \pkg{memoize}.
% While the public interface for \pkg{memoize} is fairly stable, the internals may not be, and \pkg{ltx-talk} is highly experimental. 
% The latter also uses a large number of experimental packages and makes extensive use of experimental \LaTeX{} features.
% 
% The justification for publishing this part of \pkg{memoize-ext} is essentially that anybody using \cls{ltx-talk} and \pkg{memoize} is already playing with fire, so it is better to have an unreliable extinguisher to hand than none at all.
%
% A few things you should know, even if you do not want to:
% \begin{itemize}
%   \item the code uses an internal \pkg{ltx-talk} boolean to drive extern creation and utilisation;
%   \item \texttt{talk mode to prefix} relies on an internal \pkg{ltx-talk} string;
%   \item to workaround incompatibilities between \pkg{memoize} and \pkg{pdfmanagement}, the code redefines an internal \pkg{memoize} macro\footnote{%
%     The redefinition injects code into the box \pkg{memoize} ships out which resets opacity before and after the memoized code is executed.
%     This is required because \pkg{memoize} relies on primitive shipout, whereas the implementation of opacity in \pkg{pdfmanagement} relies on \LaTeX's shipout routine.%
%   }.
% \end{itemize}
% ^^A >>> sec:talk
%
% \section{Tagged \textsc{pdf}}\label{sec:tag}
% ^^A <<< sec:tag
%
% If using the package to produce tagged \textsc{pdf}, note that the tagging support 
% \begin{itemize}
%   \item redefines the internal macro \cs{mmzIncludeExtern} during utilisation;
%   \item relies on an internal string variable in \pkg{ltsockets}.
% \end{itemize}
%
% \textbf{Correct tagging \emph{requires} that unmemoizable code be marked as such, either manually or automatically.}
% The package does this automatically for \env{tikzpicture}s which use an unsupported tagging plug, but does nothing in any other case.
% So if your picture uses \texttt{remember picture}, for example, you \emph{must} mark the code as unmemoizable or disable tagging for the affected code.
% The package will warn you about this, but that is all it does.
%
% \subsection{\TikZ{} pictures}
%
% If the content you wish to memoize is a \TikZ{} picture, you probably do not need to do anything special, but note that the default \pkg{latex-lab} plug is \emph{not} supported. 
% You must use one of \texttt{alt}, \texttt{actualtext} or \texttt{artifact}.
%
% If you use \textt{alt} or \texttt{actualtext} in the optional argument to \env{tikzpicture}, the value will be recorded in the \emph{ccmemo} for use during utilisation.
% If you set the value outside the \env{tikzpicture}, this is not necessary.
% In the latter case, the \emph{extern} will not depend on the value given (unless you request that specifically).
%
% Note that if you change the selected plug \emph{and} you set this \emph{outside} the picture, you must manually tell \pkg{memoize} it should recompile the picture, since the plug is recorded in the ccmemo, but the hash will not have changed.
%
% Note that tagging is disabled during memoization and additionally \emph{disabled for content which has just been memoizsed}.
% So when a run produces an extern, the memoized code will not be tagged at all.
%
% \textbf{Note that this package does \emph{not} support \pkg{forest}.}
% If your document uses \pkg{forest} \autocite{saso-forest}, you should either disable memoization for these pictures or load \pkg{forest-ext}\footnote{%
%   This is not necessary if you use \pkg{prooftrees}, which will load the package automatically if required.%
% } \autocite{cfr-forest-ext}.
%
% The \TikZ{} support is implemented by replacing plugs provided by \pkg{latex-lab} with versions designed for memoized content \autocite{latex-project-latex-lab-tikz}.
% Code is also installed into the same hooks \pkg{latex-lab} uses with rules to ensure this package's has priority.
%
% \DescribeSPlug{mmzx}
% Plug for \texttt{tagsupport/tikz/picture/init}
%
% If memoization is not active, the plug executes the \pkg{latex-lab} \texttt{default} plug.
%
% If some option for this package is specifically configured, it is used.
% Otherwise, the code initialisation code at the start of the picture attempts to find a match for any configured \pkg{latex-lab} plug.
% In effect, this means that you should not need to change anything in your document if you use one of the three supported plugs.
%
% If memoization is enabled but no suitable plug is found, a warning is issued and memoization aborted.  
% Otherwise, code is inserted into the ccmemo to emulate the appropriate \pkg{latex-lab} plug.
% In most cases, this code simply calls the relevant \pkg{latex-lab} plugs.
% 
%
% Plugs for \texttt{tagsupport/tikz/picture/begin} and \texttt{tagsupport/tikz/picture/end}:
%
% \DescribeSPlug{mmzx/actualtext}
% Sets up the ccmemo to use the \pkg{latex-lab} \texttt{actualtext} plugs.
% 
% \DescribeSPlug{mmzx/artifact}
% Sets up the ccmemo to use the \pkg{latex-lab} \texttt{artifact} plugs.
%
% \DescribeSPlug{mmzx/alt}
% This pair of plugs is the exception.
% Rather than writing a ccmemo which will invoke the \pkg{latex-lab} \texttt{alt} plugs, these plugs write a ccmemo which uses an alternative implementation of those plugs.
% The reimplementation uses \emph{properties} (provided by the \LaTeX{} format) rather than  \emph{rememberpicture} (provided by \pgftikz)\footnote{%
%   I considered using the support provided for \cs{includegraphic}, but this would require more intrusive changes to the internals of \pkg{memoize} and would essentially duplicate bounding box calculations already completed during memoization.%
% }.
%
% \emph{If everything looks OK, tagging is disabled for the current picture.}
% This is efficient if memoization is successful, but may be problematic if memoization is aborted or fails. 
% In this case, it may be necessary to mark the content as unmemoizable or to disable memoization for particular pictures, in order to ensure content is tagged correctly\footnote{%
%   It would be possible to disable tagging only if memoization succeeds, but I am not sure whether the structure will be right in this case?%
% }.
% 
% \subsection{Other content}
%
% If the content you wish to memoize is \emph{not} a \TikZ{} picture, you may need to read the remainder of this section.
%
% Generic support is provided in the form of two sockets which are used directly before and directly after an extern is included during utilisation.
% By default, the sockets do nothing, but they may be used to inject code which wraps the included extern in a suitable tagging structure.
% 
% Plugs may be assigned to the sockets either by writing suitable code to the ccmemo or in the document itself.
% The \TikZ{} support, for example, writes commands to the ccmemo which assign plugs analogous to the \pkg{latex-lab} plugs available for non-memoized pictures.
%
% \DescribeSock{tagsupport/memoize/include/extern/before}
%
% This socket receives three arguments during extern utilisation: the width, height and depth of the memoized content.
% The \texttt{alt} plug for \TikZ{}, for example, uses these values to calculate the bounding box required to create a \texttt{Figure} structure with \texttt{alt} text.
%
% This socket is used just before the extern is included in the document.
%
% \DescribeSock{tagsupport/memoize/include/extern/after}
%
% This socket absorbs no arguments.
% During extern utilisation, it is used immediately after inclusion of an extern.
% ^^A >>> end sec:tag
%
% ^^A sec:basics >>>
% 
% \MaybeStop{%
%   \def\glossaryname{Changes}%
%   \printbibliography
%   \PrintChanges
%   \PrintIndex
% }
% 
% \part{Implementation}
%
% A double underscore (\texttt{\_\_}) \emph{or} an ‘at’ (\texttt{@}) indicates an internal macro or key. 
% These are liable to change without notice and should not be used elsewhere.
% Some additional macros are categorised in the same way, but are named differently to simplify use in memos\footnote{%
%   This follows \pkg{memoize}'s own practice.%
% }.
%
% \makeatletter
% \let\origmaketitle\maketitle
% \NewDocumentCommand \pkginput {O{#2}m}{%
%   \begingroup
%     \def\maketitle{%
%       \expandafter\ifx\expandafter\ExplFileName\@title
%         \def\@title{\pkg{\ExplFileName-#1}}%
%       \fi
%       \ifx\@author\@empty
%         \def\@author{Clea F. Rees}%
%       \fi
%       \ifx\@date\@empty
%         \def\@date{\ExplFileVersion: \ExplFileDate}%
%       \fi
%       \let\saved@title\@title
%       \origmaketitle
%       \phantomsection
%       \addcontentsline{toc}{section}{\mdseries\pkg{\saved@title}}%
%       \fancyhf[lh]{\itshape memoize-ext-#1}%
%     }%
%     \let\Finale\relax
%     \let\PrintIndex\relax
%     \let\PrintChanges\relax
%     \input{\memoizeextdocbase -#2.dtx}%
%   \endgroup
% }
% \makeatother
%
% \section*{\pkg{\ExplFileName}}
% \addcontentsline{toc}{section}{\mdseries\pkg{\ExplFileName}}
%
%<*sty>
%<@@=mmzx>
% ^^A <<<
%    \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}[2021-11-15]% ^^A should be later
%    \end{macrocode}
% copied verbatim, excepting format from Joseph Wright's \path{siunitx.sty} under LPPL
%    \begin{macrocode}
\@ifundefined{ExplLoaderFileDate}{%
  \RequirePackage{expl3}%
}{}
%    \end{macrocode}
% almost verbatim from \path{siunitx.sty}
%
% should check date requirement (copied from chronos)
%    \begin{macrocode}
\@ifl@t@r\ExplLoaderFileDate{2022-02-24}{%
}{%
  \PackageError{memoize-ext}{Support package expl3 too old}
  {%
    You need to update your installation of the bundles 'l3kernel' and
    'l3packages'.\MessageBreak
    Loading memoize-ext will abort!%
  }%
  \endinput
}%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\GetIdInfo $Id: memoize-ext.dtx 11736 2026-03-06 08:08:45Z cfrees $ {Extensions for Memoize}
%<!debug>    \ProvidesExplPackage{\ExplFileName}{\ExplFileDate}
%<!debug>     {v0.3 \ExplFileVersion}{\ExplFileDescription}
%<debug>    \ProvidesExplPackage{\ExplFileName-debug}
%<debug>      {\ExplFileDate}{v0.3 \ExplFileVersion}{\ExplFileDescription}
%
\str_new:N \g_@@_name_str
\str_gset:NV \g_@@_name_str \ExplFileName
%
%<!debug>    \disable@package@load {memoize-ext-debug}
%<debug>    \disable@package@load {memoize-ext}
{
  Only~one~of~memoize-ext~and~memoize-ext-debug~should~be~loaded.~
  Since~
%<!debug>    memoize-ext
%<debug>    memoize-ext-debug
  ~had~been~loaded,~I~will~ignore~your~request~for~
%<debug>    memoize-ext
%<!debug>    memoize-ext-debug
.}
\SetDefaultHookLabel{memoize-ext}
%    \end{macrocode}
% \begin{var}{\l_@@_opt_tag_bool}
%   Set according to activation status by default.
%    \begin{macrocode}
\bool_new:N \l_@@_opt_tag_bool
\tag_if_active:TF 
  { \bool_set_true:N \l_@@_opt_tag_bool }
  { \bool_set_false:N \l_@@_opt_tag_bool }
%    \end{macrocode}
% \end{var}
% \begin{var}{\l_@@_opt_draw_bool,\l_@@_opt_expl_bool}
%   Other bools.
%    \begin{macrocode}
\keys_define:nn {memoize-ext}
{
%<*!debug>
  debug       .code:n     = {
    \PackageWarning{memoize-ext}{
      To~load~the~debugging~code,~use~memoize-ext-debug~instead~of~this~package.
    }
  },
%</!debug>
  expl3       .bool_set:N = \l_@@_opt_expl_bool,
  expl3       .default:n  = true,
  expl3       .initial:n  = false,
  l3draw      .bool_set:N = \l_@@_opt_draw_bool,
  l3draw      .default:n  = true,
  l3draw      .initial:n  = true,
  tag         .bool_set:N = \l_@@_opt_tag_bool,
  tag         .default:n  = true,
  talk        .bool_set:N = \l_@@_opt_talk_bool,
  talk        .default:n  = true,
  talk        .initial:n  = true,
}
\DeclareUnknownKeyHandler{
  \PassOptionsToPackage{\CurrentOption}{memoize}
}
%    \end{macrocode}
% \end{var}
% \begin{macro}{\IfFormatAtLeastTF}%^^A <<<
% Joseph Wright: from \path{siunitx.sty} ; \url{https://chat.stackexchange.com/transcript/message/64327823#64327823}
%    \begin{macrocode}
\providecommand \IfFormatAtLeastTF { \@ifl@t@r \fmtversion }
%    \end{macrocode}
% \end{macro}%^^A >>>
%    \begin{macrocode}
\IfFormatAtLeastTF { 2022-06-01 }
{
  \ProcessKeyOptions [ memoize-ext ] 
}{
  \RequirePackage { l3keys2e }
  \ProcessKeysOptions { memoize-ext }
}
%    \end{macrocode}
%^^A if we require 2022-02-24 expl3 above what is this for?
%^^A is it even possible to use that expl3 with somehow an older format?
%^^A (wasn't expl3 in the format by then?)
%    \begin{macrocode}
\IfFormatAtLeastTF { 2020-10-01 }{
}{
  \RequirePackage { xparse }
  \providecommand \ExpandArgs [1]
  { \cs_if_exist_use:c { exp_args:N #1 } }
}
%    \end{macrocode}
% Should specify next version here, most probably. 
% Or conditionalise input switch for ccmemos?
%    \begin{macrocode}
\RequirePackage{memoize}
%<debug>    \mmzset{
%<debug>      trace,
%<debug>      include~context~in~ccmemo,
%<debug>    }
%    \end{macrocode}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% temporary variables, quarks
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%    \begin{macrocode}
\bool_new:N \l_@@_tmpa_bool
\fp_new:N \l_@@_tmpa_fp
\int_new:N \l_@@_tmpa_int
\quark_new:N \q_@@_stop
\tl_new:N \l_@@_tmpa_tl
\tl_new:N \l_@@_tmpb_tl
\tl_new:N \l_@@_tmpc_tl
\seq_new:N \l_@@_tmpa_seq
\str_new:N \l_@@_tmpa_str
\str_new:N \l_@@_tmpb_str
%<*debug>
\cs_new_protected:Npn \@@_debug:n #1
{
  \iow_log:n {[mmzx~debug]::~#1}
}
\cs_generate_variant:Nn \@@_debug:n {e}
\cs_new_protected:Npn \@@_debug:N #1
{
  \@@_debug:e {\cs_to_str:N #1:~\exp_args:NV \exp_not:n #1}
}
%</debug>
%    \end{macrocode}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \pkg{tag}, \pkg{expl}, \pkg{l3draw}, \pkg{talk} loaded conditionally
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%    \begin{macrocode}
\bool_if:NT \l_@@_opt_tag_bool
{
%<!debug>      \RequirePackage{\g_@@_name_str -tag}
%<debug>      \RequirePackage{\g_@@_name_str -tag-debug}
  \hook_gput_code:nnn {package/forest/after}{.}
  {
    \hook_gput_code:nnn {begindocument/before}{.}
    {
      \IfPackageLoadedF {forest-lib-ext.tagging}
      {
        \IfPackageLoadedF {forest-lib-ext.tagging-debug}
        {
          \msg_warning:nnnnnn {memoize-ext}{unsupported}{forest}
          {forest-lib-ext.tagging.sty}{forest-ext}
          {forest~trees~will~not~be~correctly~tagged~and~may~cause~fatal~
          compilation~errors.}
        }
      }
    }
  }
}
%    \end{macrocode}
% \pkg{memoize-ext-expl3}[\pkg{-debug}]
%    \begin{macrocode}
\bool_if:NT \l_@@_opt_expl_bool
{
%<!debug>      \RequirePackage{\g_@@_name_str -expl3}
%<debug>      \RequirePackage{\g_@@_name_str -expl3-debug}
}
%    \end{macrocode}
% \pkg{memoize-ext-l3draw}[\pkg{-debug}]
%    \begin{macrocode}
\hook_gput_code:nnn {package/l3draw/after}{.}
{
  \bool_if:NT \l_@@_opt_draw_bool
  { 
%<!debug>        \RequirePackage {\g_@@_name_str -l3draw}
%<debug>      \@@_debug:n {Loading~memoize-ext-l3draw-debug.}
%<debug>        \RequirePackage {\g_@@_name_str -l3draw-debug}
  }
}
%    \end{macrocode}
% \pkg{memoize-ext-talk}[\pkg{-debug}]
%    \begin{macrocode}
\hook_gput_code:nnn {class/ltx-talk/after} {.}
{
  \bool_if:NT \l_@@_opt_talk_bool
  {
%<!debug>      \RequirePackage{memoize-ext-talk}
%<debug>      \@@_debug:n {Loading~memoize-ext-talk-debug.}
%<debug>      \RequirePackage{memoize-ext-talk-debug}
  }
}
%    \end{macrocode}
% \begin{macro}{\@@_noop:,\@@_noop:n}
%   Do nothing successfully.
%    \begin{macrocode}
\cs_new:Npn \@@_noop: {}
\cs_new:Npn \@@_noop:n {}
%    \end{macrocode}
% \end{macro}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% NaCl \textbar{} halen \textbar{} salt
% \changes{v0.3}{2026-03-05}{Add tagging status to salt.}
%    \begin{macrocode}
\toksapp\mmzSalt{
  Tagging~status:~\tag_if_active_p:
}
%    \end{macrocode}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% messages
%    \begin{macrocode}
\msg_new:nnnn {memoize-ext}{unsupported}
{
  \msg_warning_text:n {memoize-ext}:~
  Non-existent~or~inappropriate~version~of~#2~from~#3~\msg_line_context:.~
  #4
} {
  memoize-ext#1~requires~an~appropriate~version~of~#2~from~#3.
}
%    \end{macrocode}
% ^^A >>>
%</sty>
%
% \pkginput{expl3}
% \pkginput{l3draw}
% ^^A \pkginput{properties}
% \pkginput{sockets}
% \pkginput{tag}
% ^^A \pkginput{tagging-tikz}
% \pkginput{talk}
% 
% \twreg
% \printbibliography
%\Finale
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
%^^A vim: et:tw=0:sw=2:ts=2:foldmethod=marker:fmr=<<<,>>>:
